//! 协议处理器实现

use std::collections::HashMap;
use std::sync::Arc;
use tokio::sync::RwLock;
use tracing::{info, error, debug};

use nacos_core::{ClusterNode, Result, NacosError};
use nacos_core::traits::{NetworkService, NetworkRequest, NetworkResponse};

use super::ProtocolHandler;

/// Nacos gRPC协议处理器
pub struct NacosGrpcHandler {
    endpoints: Arc<RwLock<HashMap<String, String>>>,
}

impl NacosGrpcHandler {
    pub fn new() -> Self {
        Self {
            endpoints: Arc::new(RwLock::new(HashMap::new())),
        }
    }

    pub async fn register_endpoint(&self,
        service: String,
        endpoint: String,
    ) {
        let mut endpoints = self.endpoints.write().await;
        endpoints.insert(service.clone(), endpoint.clone());
        info!("注册gRPC端点: {} -> {}", service, endpoint);
    }
}

#[async_trait::async_trait]
impl ProtocolHandler for NacosGrpcHandler {
    async fn handle_request(
        &self,
        request: NetworkRequest,
        source_node: Option<ClusterNode>,
    ) -> Result<NetworkResponse> {
        debug!("处理gRPC请求: {}", request.request_id);
        
        // 这里应该调用实际的gRPC服务
        let response = NetworkResponse {
            request_id: request.request_id.clone(),
            success: true,
            error_code: 0,
            error_message: String::new(),
            body: format!("gRPC处理结果: {}", String::from_utf8_lossy(&request.body))
                .into_bytes(),
        };
        
        Ok(response)
    }

    async fn handle_response(
        &self,
        response: NetworkResponse,
        _source_node: Option<ClusterNode>,
    ) -> Result<()> {
        debug!("处理gRPC响应: {}", response.request_id);
        Ok(())
    }

    fn supported_protocols(&self) -> Vec<String> {
        vec!["nacos_grpc".to_string()]
    }

    fn name(&self) -> String {
        "nacos_grpc".to_string()
    }
}

/// HTTP协议处理器
pub struct HttpHandler {
    base_url: String,
    timeout: u64,
}

impl HttpHandler {
    pub fn new() -> Self {
        Self {
            base_url: "http://localhost:8848".to_string(),
            timeout: 30000,
        }
    }

    pub fn with_config(base_url: String, timeout: u64) -> Self {
        Self { base_url, timeout }
    }
}

#[async_trait::async_trait]
impl ProtocolHandler for HttpHandler {
    async fn handle_request(
        &self,
        request: NetworkRequest,
        _source_node: Option<ClusterNode>,
    ) -> Result<NetworkResponse> {
        debug!("处理HTTP请求: {}", request.request_id);
        
        // 这里应该实现HTTP客户端逻辑
        let response = NetworkResponse {
            request_id: request.request_id.clone(),
            success: true,
            error_code: 0,
            error_message: String::new(),
            body: format!("HTTP处理结果: {}", String::from_utf8_lossy(&request.body))
                .into_bytes(),
        };
        
        Ok(response)
    }

    async fn handle_response(
        &self,
        response: NetworkResponse,
        _source_node: Option<ClusterNode>,
    ) -> Result<()> {
        debug!("处理HTTP响应: {}", response.request_id);
        Ok(())
    }

    fn supported_protocols(&self) -> Vec<String> {
        vec!["http".to_string(), "https".to_string()]
    }

    fn name(&self) -> String {
        "http".to_string()
    }
}

/// TCP协议处理器
pub struct TcpHandler {
    port: u16,
    max_connections: usize,
}

impl TcpHandler {
    pub fn new() -> Self {
        Self {
            port: 9000,
            max_connections: 1000,
        }
    }

    pub fn with_config(port: u16, max_connections: usize) -> Self {
        Self { port, max_connections }
    }
}

#[async_trait::async_trait]
impl ProtocolHandler for TcpHandler {
    async fn handle_request(
        &self,
        request: NetworkRequest,
        _source_node: Option<ClusterNode>,
    ) -> Result<NetworkResponse> {
        debug!("处理TCP请求: {}", request.request_id);
        
        // 这里应该实现TCP客户端逻辑
        let response = NetworkResponse {
            request_id: request.request_id.clone(),
            success: true,
            error_code: 0,
            error_message: String::new(),
            body: format!("TCP处理结果: {}", String::from_utf8_lossy(&request.body))
                .into_bytes(),
        };
        
        Ok(response)
    }

    async fn handle_response(
        &self,
        response: NetworkResponse,
        _source_node: Option<ClusterNode>,
    ) -> Result<()> {
        debug!("处理TCP响应: {}", response.request_id);
        Ok(())
    }

    fn supported_protocols(&self) -> Vec<String> {
        vec!["tcp".to_string()]
    }

    fn name(&self) -> String {
        "tcp".to_string()
    }
}

/// 不支持的协议处理器
pub struct UnsupportedHandler;

impl UnsupportedHandler {
    pub fn new() -> Self {
        UnsupportedHandler
    }
}

#[async_trait::async_trait]
impl ProtocolHandler for UnsupportedHandler {
    async fn handle_request(
        &self,
        request: NetworkRequest,
        _source_node: Option<ClusterNode>,
    ) -> Result<NetworkResponse> {
        error!("不支持的协议请求: {}", request.request_id);
        Err(NacosError::Protocol("不支持的协议".to_string()))
    }

    async fn handle_response(
        &self,
        _response: NetworkResponse,
        _source_node: Option<ClusterNode>,
    ) -> Result<()> {
        Err(NacosError::Protocol("不支持的协议".to_string()))
    }

    fn supported_protocols(&self) -> Vec<String> {
        vec![]
    }

    fn name(&self) -> String {
        "unsupported".to_string()
    }
}